BHV-6774: add / remove "hover" class from paging controls when pointer mode changes

Fixing http://jira2.lgsvl.com/browse/BHV-6774

Dual focus on pressing left key while hover cursor over the paging down control of DataGridList
To solve this issue, add / remove "hover" class from paging controls when pointer mode changes.

DCO-1.1-Signed-Off-By: Kunmyon Choi <kunmyon.choi@lge.com>